Bending brake with adjustable work stop and clamping means



June 28, 1949. V F, UNDER 2,474,683

BENDING BAKE WITH ADJUSTABLE WORK STOP AND CLAMPING MEANS Filed April 22, 1946 3 Sheets-Sheet 1 O com me/vwo@ VICTOR F. LINDER w, @gw my June 28, 1949. v. F. LINDER 2,474,683

BENDING BRAKE WITH ADJUSTABLE WORK STOP AND CLAMPING MEANS Filed April 22, 1946 s sheets-.sheet 2 llll 68 1 nun 2s i 2a O/E 7| 86 bwa/wm vvuczToR F. UNDER www( June 28, 1949.

V. F. LINDER BENDING BRAKE WI 2,474,683 ADJUS TAB PING MEA WORK STOP AND C Filed April 22, 1946 3 Sheets-Sheet 3 l I" l l,

N INVENTOR D VICTOR F. LINDER ATToRNEysv se se Patented June 28, 1949 BENDING BRAKE-WITH ADJUSTABLE'WORK STOPA'ND CLAMPI'NG MEANS Victor Linder,` Minneapolis, Mnn.,- assignorvtorf' AlbertT. ONeil, Minneapolis, Minn'.

' Application" April 22, 1946i Serial N0. 663,884

My.: inventioirreiates to# metal ybrakes and 1has forenobfjfect toprovide asimple and practical metals brake which may befmanually" operated to bend and form various types of work and Awith a great `variety ofbendslanld lforms; 1

l Another obieetfof the Iinvention resides in, providingfa metall-brake 1in" which? the 'work is `rigidly and'u'se -rely"aftatih'edtllthebed Orr which the sameflisisupported; i

Another objectief thetinvention residesiir pro-r vidingfthe'lbrakewitl'r a jawffor clamping the work to the 'bed'"andiniurther providing adjusting means for reg-ulating' the distance of the forming edgeloi theijawfrom the correspondingredgeor the "'bender.

A still- -furtlier obdecto'flthe invention resides in'f eprovidinga brake in=` which narrow offsets can bebentin sheetsoff metal and in which theberid`` ing bar of the *bender 1 is "exceedingly rigid and properly supported to Tormthetwork as desired;

Another' objeot of ythe*inventionresides inprovi'din'g a Llever `assoeiat'eii*with`V the clamping jaw a-ndfconnected theretorbymeans of a link and in further providing operating imeans `for movingv the lever to the bed. V

A stilliurther objectief the invention resides inv procure movement of the jawy toward` providing "arock isha-ft "for moving Saidi liever and'r inz furtherlproviding a "thrust member between saictrockshaftiandlever and adapted to move thesameupon swinging or the shaft. p

Anotheriobject othe'nvention resides' incon-` struct-Ling" the roeksh-aft 'andy lever with facing notchesand'u in constructing the thrust member with fiilcrumsf seated said notches;

An lolajectnor the invention residesin providing on for adjusting the angle off' bend' af-const'ruc oflfthe workw A featureof theinvention resides in constructing said "adjusting means with an adjustable" stopand adapted to engage anfengaging member A feature of` the invention resides in pivoting said stopon said rock shaft. r l

`Another object Aof the invention resides constructing'pthe bendewith a purality of circumferentiallyl arranged sockets andl in providing apininsertable 'into' any of fthe said sockets and. forming `the engaging' member `of'` the invention.`

Other objects of the" invention reside inthen novel combination. and arrangement of parts and inthe details"of"`construction hereinafter illus-4 traten arid/or described In thedrawings:A il

Fig. 1 is a plan vievvoi` a metal1 brake illustratiL ingaan embodimentofmy invention.

l'fig;` 2 is elevational@ sectional? view taken' on line 2-"-2\ofFigzV 1 andfdrawnito a greaterscale. Fig. 3 is a sectionall-view rta-Kenton line 3-3 of Fig. 1' and drawn toi thesame scale as' Fig. 2LT

Fig. 4 is a: perspectiveviewoftheinventon- My invention consists'. of anbase Ifilliavingy two standards r'l l" f and y i F2?projecting1y :upwa-rd'ly* there` from. These standards have mounted? them stubf'shafts? lf3 `which lairedisposed alignment and which Ipivotally 'support a-fbender indicated irrite` entirety by the -reference numeral' |14 "for swingingi movement relative fto the: base I 0. "I The base fl' has two1 supportinga 'blooksv I'5 formed thereon `andrwhieh"carry awbed` I-6."'` Th'ebed 16' iswattached to the" blocks l byL means of screws lilvwhichvextend throughrsaid bedV andare coun-` tersunlo into'` the upper #surface I 9" of saidf 5 bedi and- Whfiel-iv are screwed i`ntof thei blocks t5. Mounted'A on: the bed' lr6' `-isfaclamping `device l 8= which' supports` the work `tovbefformedon the loe'dV lf'fand which provides a Vformi-ngedge'overwhich the `work may*` bedient.'

said" bar ande are screwed into thefoffsetportions. Ztmtovv securely attach :the Y@bar to the same.' By means of this construction, the twofarmsfZl' and 2 2;- of `the bender I4 are' rigdlytied' `together `and operatein unisonzr` Thebedlfllif-is cut back atan angle alongcthe` surface 21 thereof fshown in Fig;` 2-.1` Thebar 2`4is similarlyrcut back along the upper .fportiomzof 'the sama? so that when' the bender I4 is swung"intofthefpositionlshown Figs` 2, 'thefsaid 4bar haswarnarrowsurface 29V` whiohfliesin continuationot' the upper surface of' thefbed |62 The lsurfacey 291 is further reduced by cuttingthesa'me 'back as indicated at 32 'in Fig.J For swinging the-'the bender l'd'jtwo rods 33-are employedl :which are attached to the lowerl ends-3410i the arms 2'lf"andr2'2 Thisis accom: pl-ished` by means of capflscrews 35' which are screwedfinto said portions 'of-.f said arms; The

handles 36 1 by means; oi whieh;Jthefisaid' benderil 3 may be swung about the axis of the stub shafts I3.

The clamping device I8 comprises a jaw 31 in the form of a flat bar which has a beveled face 38 at the forward portion of the same and a flat surface 39 at the lower portion of the same. The jaw 31 overlies the bed I6 and is disposed with the surface 39 facing the surface I9 of said bed. The jaw 31 is held in place thereon by means of the following construction:

At the ends of the jaw 31 are formed two elongated holes 4I and through which two bolts 42 extend. A washer 43 encircles each of these bolts and rests upon the upper surface of the jaw 31. A nut 44, screwed upon each bolt adjusts the position of the jaw 31 with reference to the v bed I6 in a manner to be presently described in detail. The movement of the jaw 31 toward the bed I6 is controlled by"means of set screws 45 which are threaded into "the said jaw and engage the upper surface I 9 of the bed I6.

The jaw 31 is urged upwardly by means of compression coil springs 46 which are received in cavities 41 formed in the bed I6 and encircling the bolts 42. The said springs engage the bed I6 from above and the jaw 31 from below and urge the said jaw upwardly, so that the sheet metal to be bent and which is indicated in dotted lines at 48 canbe readily inserted in between the said jaw and bed.

For operating the jaw 31 to cause the same to clamp the work 48 upon the bed I6, a rock shaft 49 is employed. This rock shaft extends through the two standards II and I2 and is journaled in bearings formed therein. Said shaft also extends through the two blocks I and is likewise further journaled in bearings formed in said blocks. The shaft 49 is located intermediate the base I0 and the bed I6. Below the shaft 49 and overlying the base IIJ are two levers 5I which are identical in construction. The said levers have holes 52 extending through the same yand through which the bolts 42 loosely extend. The heads 53 of the bolts 42 engage the said levers from beneath and when the levers are moved downwardly, the said bolts draw upon the jaw 31 and urge the same downwardly toward the bed I6 in opposition to the springs 46. For supporting the levers 5I for swinging movement, two pins 54 are employed which are set into the base IIJ and project upwardly therefrom. These pins are received in holes 55 drilled in the levers 5I which holes are fairly loose to permit of the said levers rocking to move the jaw 31. The levers 5I engage the base I9' at the'localities indicated at '56 which forms the fulcrum vpoints for the levers. The pins 54 and the holes 55 hold the levers in operating position.

For operating the levers 5I, the said levers are each provided with aV-shaped notch 51. In a similar manner, the shaft 49 has two V-shaped notches 58 which are eccentric with reference to the axis of the said shaft and which are disposed immediately above the notches 51. These notches serve as bearings. Between the shaft 49 and the levers 5I are disposed two thrust members 59 which have fulcrums 6I and 62 seated in the notches 58 and 51. When the shaft 49 is in the position shown in Fig. 2, the crotch of the notch 58 is to the right of the lines joining the axis of the shaft 56 and the crotch of the shaft 59. Movement of the shaft in a clockwise direction, as viewed in Fig. 2, causes the crotch of the notch 58 to move to a4 position substantially in said line previously referred to, or a slight '4 amount to the left of said line. This urges the levers 5I downwardly and the bolts 42 which form in links between the levers 5I and the jaw 31 draw the jaw downwardly to clamp the work 48 disposed between said jaw and the bed I6.

For rocking the rock shaft 49, a rod 8| is employed which is formed with a head through which said shaft extends. 'This head is attached to the end of said shaft by means of a set screw 82, shown in Figs. 1 and 4. The said rod extends upwardly and has a handle 83 secured to the upper portion ofthe same.

The thrust members 59 are held from endwise movement in one direction by engagement with the blocks I5. For holding said thrust members from movement in the opposite direction, pins 84 are employed which are shown in detail in Fig. 3 and which are disposed in transverse holes 85 drilled in the shaft 49. These holes are so located that the pins 84T engage the ends of the thrust members 59 which are opposite to the ends engaged by the blocks I5. By means of this construction, the shaft 49 is also held from endwise movement.

In order to form different types of bends on the work, for example, bends of smaller or greater radii, the forward edge 63 of the jaw 31 is guided for movement toward and from the correspond. ing edge 64 of the bed I6. Such movement is accommodated by means of the elongated slots 4I as previously described. The distance between the edges 63 and 64 is maintained by means of' set screws 65 which are screwed into lugs 66 issue ing upwardly from the bed I6. Said lugs may be made integral with the bed or the same may be made separate, as shown, and attached to the said bed by means of cap screws 61, as illustrated in Figs. 2 and 4 ofthe drawings. The edge 68 of the forming bar 24 and the edge 64 of the bed I6 are substantially at the axes of the two stub shafts I3. When the edge 63 is .close to the axes of the stub shafts, a sharp bend with small radius is-produced. `When the edge 63 ismoved away from the edge 64, a bend with greater radius is procured.

In order to determine the angle to which the work is to be bent, two stops 1I and 12 are employed which are rotatably mounted on the rockshaft 49 between the levers 5I and the arms 2I and 22. Both of these stops being identical in construction, only the stop 12 will be described in detail and which is best shown inFigs. 3 and 4. This stop -comprises an upwardly extending arm 13 which has an engaging portion 14 formed with an engaging surface 15. The said surface 15 maybe engaged by means of a pin 16 insertable into any of a number of drilled holes 11 arranged in When.

circumferential formation on the arm 2|. this pin engages the engaging surface 15, movement of the bender I4 is terminated. Coarse adjustment of the angularity of the bend may be procured by inserting the pin 16 in the'proper hole 11. Fine .adjustment of the angle may be procured by means of an adjusting screw 86 which is screwed into an arm 81 formed on the stop 12. The screw 86 engages the base III and.

axisvofthe ystub` shafts 1,131.6. The: bendenleispositienedwas, shownzinvliig 2 andfthe:workprsheet #BC-insertedzyibetween thecijgaw BlandA therbed-lc Ili'evjavv` .31.: isiheld. in :upward spaced relation `to the bedr l lflofy. means?y :ofi zthe"` springs 46;.: :so that thevsheetwmay be.:readil Minsertedfbetween the surfacesv 3-9'1 andwl .bfiztli'e jaw` and?. bed. Handle 83'.: is;` tlien:` moved tothe right, as iviewediirr` Fig.:` 2. This. i rocks the shaft? 419s. and'.` thea thrust: 'members 59.9are moved..towardalignment with the axis of the said shaft and the crotches of the notches I51. This swings the levers..5|` downwardly and the links `ll2..draw.the jawtl. downwardly in` a manner to clamp the work 48.'.betweensaid` jaw and the bed I6. If the pressure on the two ends of the jaw areiunequal, the same may be equalized byadjusting the nutsM;r The pins. 'leare next inserted into the proper holes Tlfu andthe stop T2 roughly adjusted through.` the adjusting screws-t6;` The bender I4 isthen swungqforwardl'y by manipulation of .the.handlesril-B-until thepins i6-engage the surfaces 15 of the stops 'H and. .12....If the angle is not proper, `thestops 'H and l2 are readjusted through the adjusting screws 86 untilthe' desi-rediang-ularity is procured. Uponswi-nging the bendervl 4 downwardly and the handle` 83 toward the left, `asviewed in Fig; 2, the Work vcan beremoved.

The advantages of my invention are manifest. The device functions in an eflicient effective manner. With my invention repeated, operations can be readily performed. By means of the adjustable stops, the angularity of the bend can be accurately determined. Having stops at both ends of the device, the angularity at both ends of the work can be made the same. By adjustment of the jaw member, the curvature of the work can be controlled at will. The clamping device serves to hold the work rigidly in position and is quickly applied and released. By means of the notched rock shaft and levers and the thrust members cooperating therewith, extremely great pressure is procured on the jaw whereby the work is firmly held in position. By constructing the forming bar in the manner disclosed and extending in a direction at right angles to the direction of the extent of the bed when in normal position, an extremely narrow engaging surface can be procured whereby narrow, short offset bends, such as Z-shaped bends, can be procured. My invention is extremely sturdy in construction and will operate to bend fairly heavy material.

Changes in the specific form of my invention, as herein disclosed may be made within the scope of what is claimed without departing from the spirit of my invention.

Having described my invention, what I claim as new and desire to protect by Letters Patent 1s:

1. In a metal brake, a bed, a jaw overlying said bed, a lever supported for swinging movement relative to said bed, connecting means between said lever and jaw, a rock shaft disposed in spaced relation to said lever a second lever secured to said rock shaft for rocking the same, Said shaft having an eccentrically disposed bearing therein and said lever having a bearing facing the bearing in said shaft, a thrust member extending between said shafts and lever and having portions engaging said bearings, said shaft, upon rocking movement, swinging said lever to cause relative movement between said jaw and bed.

2. In a metal brake, a bed, a jaw overlying said bed, a lever supported for swinging movement relative to said bed, connecting means between saidfleverandujawra rock-.shaft disposedin spaced rel-ation to( said: lever,` `said :lever havin-g` a f V shape'dfrnotch `:thereim` said rock i shaft l having `a `Wshapedy 7notch: ytherein eccentric; with `respect to; the: axis of said: shaftlA and' facing the notch in saidilever,` and a thrust member disposed between saidrocknshaft andyflever and having two full-- crumst. one seated :inI thel notch. Ain the lever and the etherfseatedvinwthe notch-` in` the shaft,` said shaft'upon rotation movi-ng. said thrust member tovcausetmovementmf therlever away from the shaftzvandxmcvement of thejaw toward said bed.

3..,In ametaltbralce, a bed, a jaw overlying said bed, I. a. wlever,l supported4 for swinging movement relativer to said-.fbedf,` iconnecting means between said'flever and` ja'wya rock shaft disposedin spaced relation 'Itonsaid-clever,isaidileverl having a V- shapedmnotch therein, saidf rock shaft having la V-shapednotch thereineccentric withv respect to axistof-said .shaft and facing 4the `notch `in saidlleverpanda thrust member disposed between saidcrock shafztfand' lever andhaving` two ful-J crnmsgone' seateduinalthe notch in the lever andi the4 other seated- `notch 'i-nfthe shaft,` said" notch in the i l'ever being: directly below the axis "of saidL shaft;...said. fshaft; upon .:rotation,. moving said thrust member :tocause movement 4of: the lever away from the,shaitzt'an'di` movement of the, jaw toward said bed.

4. In a metal brake, a base, a bed spaced from and disposed above said base, a jaw overlying said bed, a lever overlying said base, a bolt extending through said lever, bed and jaw and loosely tting within the same, a head on said bolt engaging the lever from below, a nut on said bolt engaging said jaw from above, said bolt forming a link connecting said jaw member with said lever, said bed having a cavity in the upper portion of the same encircling said bolt, a spring in Said cavity engaging said bed from above and said jaw from below and urging said jaw upwardly, and means between said bed and lever for moving said lever downwardly to engage the head on said bolt and thereby urge said jaw toward said bed in opposition to Said spring.

5. In a metal brake, supporting means, a bed carried by said supporting means, means for clamping the work on said bed, a bender, pivot means for supporting said bender for swinging movement in a manner to form the work on the bed, a stop pivoted to said supporting means and having engaging means, an engaging member carried by said bender and adapted to engage the engaging means of the stop, said engaging means being adapted to move substantially in the same direction as the engaging member and a screw carried by said stop and engaging said supporting means and moving the stop in one direction and limiting movement of the stop in the opposite direction.

6. In a metal brake, a support, a bed carried thereby, means for clamping the work on said bed and including a rock shaft, a bender, a stop pivoted on said rock shaft and including two arms, engaging means formed on one of said arms, an engaging member carried by said bender and adapted to engage the engaging means of the stop, and a screw carried by said second arm and engaging said support for limiting the movement of said stop about said shaft.

7. In a metal brake, a support, a bed carried thereby, means for clamping the work on said bed and including a rock shaft, a bender, a stop pivoted on said rock shaft and including two arms, engaging means on one of said arms, said "mM-N bender having a plurality of sockets circumferentially arranged about the axis of the pivot means therefor, a pin adapted to be positioned in any of said sockets and adapted to engage the engaging means of the stop, said stop including a second arm and a screw carried by said second arm and engaging said support for limiting the movement of said stop about said shaft.

8. In a metal brake, supporting means, a bed carried by said supporting means, means for clamping the work on said bed, a bender, pivot means for supporting said bender for swinging movement in a manner to form the work on the bed, a stop pivoted to said supporting means and having engaging means, an engaging member carried by said bender and adapted to engage the engaging means of the stop, said engaging means being adapted to move substantially in the same direction as the engaging member and a screw carried by said stop and disposed in the plane of movement of said stop and tangent to a circle having its center at the axis of said stop, said screw engaging said supporting means and moving said stop in one direction and limiting movement of said stop in the other direction.

9. In a metal brake, a bed, a jaw overlying said bed, a lever supported for swinging movement relative to said bed, connecting means be- 8, tweenk said lever and jaw, a rock shaft disposed in spaced relation to said lever, said lever and rock shaft having opposed bearings, the bearing on said rock shaft being eccentric, and a thrust member disposed between said lever and shaft and engaging said bearings, said shaft upon rotation moving said thrust member to cause movement of the lever away from said shaft and movement of the jaw toward said bed.

VICTOR F. LINDER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 72,478 Gleason Dec. 24, 1867 816,917 Keene Apr. 3, 1906 836,676 Frey Nov. 27, 1906 951,639 Frazier Mar. 8, 1910 2,401,031 Manasek Oct. 12, 1944 2,417,478 Flowers Mar. 18, 1947 FOREIGN PATENTS Number Country Date 69,110 Germany June 10, 1893 808,486 France Nov. 14, 1936 

